I am not going to write a lot right now, but it sure looks like a reasonable size meteor hit Chelyabinsk, Russia. Lots of videos are online that look like the same object. I would be skeptical of this type of story at first, but there are lots of videos and they all look like the same object so it appears real or a hell of a sick, coordinated viral marketing campaign.
Here is one of the best videos.
As I said, there are a lot. Here is a link to many others.
This seems to be the page with the most info (although I am not sure how accurate it all is) including a pic of a factory allegedly damaged by the fall.
I am sure more will be forthcoming on this in the coming hours.